If singleplayer:
A complex transmog system that has gacha style of different 'currencies' (shit tier crafting ingredients) and layers of abstraction, some of which functionally require being subbed to a battlepass which allows you to purchase some necessary key items to the transmog process only after you've done all your monotonous dailies for 3 weeks without missing a single one.
If multiplayer:
'Radiant' style quests revolving around escorting a low health, brain dead at path finding npc, which walks slower than your run speed but faster than your walk speed, through a PvP combat zone, who frequently has random mental breakdowns and must be reassured everything will be alright through a 22 step dialog tree process, which is largely randomized everytime, in order to keep them moving.
You and the npc can be killed during conversation segments, which you cannot exit from at whim, you must complete the dialog tree successfully to regain control of your character and exit the 'cinematic dialog' mode.